mali_kbase: platform: metrics: Support tracking per-UID time in state

Add handlers for context creation/disable and job submission/completion
and use this data to assemble a view on how much time each UID spent at
each operating point on the GPU.

Bug: 171975331
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: Ia6cda16590cb6bdbae0ac0e1b157e478c1e4b7ce